//include the servo motor library
#include <servo.h>
//define the LDR sensor pins
#define LDR1 A0
#define LDR2 A1//define the error value,you can change it as you like
#define error 10
//starting point of the servomotor
int spoint= 90;
//create object for the servo mototr
Servo servo;

void setup() {
  //include the servomotor PWM pin
  servo.attach(11);
  //set the starting point of the servo
  servo.write(spoint);
  delay(1000);

}

void loop() {
  //get the LDR sensor value
  int ldr1=analogRead(LDR1);
  //get the LDR sensor value
  int ldr2=analogRead(LDR2);

  //get the differnece for these value
  int value1 =abs(ldr1-ldr2);
  int value2 =abs(ldr2-ldr1);

  //check the value using if condition
  if (value <= error) || (value <= error)){

  }else{
    if (ldr1 > ldr2) {
      spoint= --spoint;
    }
    if (ldr1 < ldr2) {
      spoint=++spoint;
    }
  }
  //write values on the servo motor
    servo.write(Spoint);
   delay(80);

    })
    }
  }
}